KR20150107308A - Front subframe for car body - Google Patents

Abstract

The present invention relates to a front subframe which can secure vehicle body structural rigidity and maximize a space of an engine room. According to the present invention, provided is a front subframe for a vehicle body. Moreover, a new type of a front subframe structure is realized by being applied with a front structure extended in a subframe side having a protruding type structure and a reinforcing member for a vehicle body connection reinforcement structure, thereby securing vehicle body rigidity capable of actively dealing with new vehicle safety evaluation and maximizing a space of an engine room.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front subframe for a car body,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a front subframe of an automobile body, and more particularly, to a front subframe having a protruding structure capable of securing structural rigidity of a vehicle body and maximizing space in an engine room.

Generally, an automobile body is composed of a main frame and a subframe, and the subframe is composed of a front subframe forming the lower front end of the vehicle body and a rear subframe forming the rear lower end of the vehicle body.

Devices such as a transmission including an engine are mounted on the upper side of the front sub-frame, and the lower side of the front sub-frame is connected to a lower arm of the front suspension to secure the structural rigidity of the vehicle and facilitate load transmission.

In the front subframe, the vehicle body is connected to two positions on the front side and the rear side, and the front lower arm is connected to the front and rear sides in the same manner as the vehicle body.

Such front subframes are disclosed in Korean Patent No. 10-0831470 and Korean Patent Application No. 10-2007-0060400.

As an example, FIG. 8 shows a front sub-frame of a typical automobile body.

8, the front sub-frame 100 has a rectangular frame including a front member 110 at the front, a rear member 120 at the rear, and a side member 130 at the left and right in the longitudinal direction .

The front subframe 100 is provided with a body mounting portion 140 on both sides of the front and rear sides of the front subframe 100. The bodyfitting portion 140 at this time has a structure in which the left and right members of the front subframe 100 and the front and rear members .

However, the conventional front sub-frame structure is limited in terms of positively responding to the New Car Assessment Program (NCAP) in the trend of strengthening gradually, and it is difficult to secure the space of the engine room as a whole, There is a disadvantage that the degree of freedom is low when designing parts and layout of parts such as a power train, and the like.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a front sub-frame structure in which a front structure extending on the side of a sub-frame of a protruding structure, a reinforcement member for a body- The present invention aims to provide a front subframe of a vehicle body capable of securing body rigidity capable of responding positively to a new vehicle safety evaluation and maximizing the space of the engine room.

In order to achieve the above object, the present invention provides a front sub-frame of a vehicle body having the following features.

Wherein the front sub-frame is a front sub-frame for supporting a lower portion of a frame structure composed of a front bumper back beam, a rear fender apron, and side members connected between the bumper back beam and the fender apron, A protruding sub-frame having a front structure connection portion protruding from both sides of the front end portion while being connected to the frame structure 13 and a rear end supported by a front structure connection portion of the protruding sub-frame, And a front structure connected transversely between the side structures of the side structures and the front ends of the side structures.

Therefore, the front sub-frame can maximize the space of the engine room through the protruding sub-frame structure.

Here, the front structural joints on both sides of the protruding sub-frame are formed in a rectangular tube shape having a bamboo-type pipe embedded therein and formed in a posture angled outward at a predetermined angle, and a lower arm "A" .

Particularly, the front sub-frame is disposed outside the side member in the frame structure and connected to the bumper back beam and the fender apron, and is connected to the front structure of the front sub-frame through the lower end of the front end portion, Thereby reinforcing the cowl / fender aprons and strengthening the front of the front structure.

The reinforcing member is preferably joined to the side member of the frame structure in parallel with the side member in a lengthwise section, so that the reinforcing member can have a double box-shaped cross-section.

In addition, the reinforcing members of both sides may have a straight shape, a shape having a vertical bending section, a shape having a sloping section, and the like, and may be installed symmetrically or asymmetrically.

The front subframe of the automobile body provided in the present invention has the following advantages.

First, it is possible to overcome the limited space of the engine room by enlarging the expansion direction of the protruding front structure outwardly.

Second, it is possible to increase the degree of freedom of use of mass production vehicles, which can be applied without changing the engines of various vehicles under mass production at present.

Third, the front and rear mounting structure of the protruding type front structure can be improved, and the protruding type front structure can be applied to the existing skeletal structure to increase the collision load absorption efficiency and to increase the collision performance and skeletal rigidity.

1 is a perspective view illustrating a front sub-frame according to an embodiment of the present invention;
2A and 2B are a perspective view and a plan view showing a front structure in a front sub-frame according to an embodiment of the present invention.
3 is a perspective view illustrating a process of fabricating a protruding sub-frame in a front sub-frame according to an embodiment of the present invention.
4 is a side view and a cross-sectional view showing another example of a reinforcing member in a front surf frame according to an embodiment of the present invention;
FIG. 5 is a plan view and a cross-sectional view showing a state of securing a gap between an existing structure and an improved structure in a front sub-frame according to an embodiment of the present invention
6 is a perspective view showing a state in which a gap is ensured when the engine is mounted in a front sub-frame according to an embodiment of the present invention.
FIG. 7 is a graph and a simulation photograph showing a frontal new-vehicle safety evaluation analysis for a front sub-frame according to an embodiment of the present invention.
8 is a perspective view showing a conventional general front saver frame.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a front sub-frame according to an embodiment of the present invention.

As shown in FIG. 1, the front sub-frame 14 may be installed under the frame structure 13 at the front of the vehicle body, such as an engine room, to enhance the structural rigidity of the front portion of the vehicle body, It can be maximized.

The front subframe 14 includes a bumper back beam 10 disposed at the front side and a fender apron 11 disposed at the rear side of the front subframe 14 and a fender apron 11 disposed between the bumper back beam 10 and the fender apron 11, The side members 12 of the frame structure 13. [0031]

The front sub-frame 14 disposed in this way includes a lower front structure 19 and both reinforcing members 22. The front structure 19 at this time is located in a protruding sub- Side connecting portions 21 of the side members 12 and connected to the side of the reinforcing member 22 by using side structures 17a and 17b to be described later.

The reinforcement member 22 is a member that has a box-like cross-sectional structure and strengthens the connection of the vehicle body. The reinforcement member 22 is disposed outside the side members 12 on the frame structure 13, (11).

That is, the rear end portion of the reinforcing member 22 is connected to the fender apron 11 side, the front end portion thereof is connected to the bumper back beam 10 side, and the front structure 19 of the front sub- And is connected to the upper surface of the distal end portion of the side structures 17a and 17b.

The reinforcing member 22 may be formed of two pieces arranged side by side on the outer side of the side member 12 and may have a shape extending straightly with reference to the length of the member, And a shape in which the middle part of the length is inclined.

The reinforcing members 22 having various shapes may be installed so as to be symmetrical in the left and right direction with respect to the same type of vehicle according to the specification of the vehicle type or may be installed so as to have a left- .

FIG. 1 shows an example in which a reinforcing member 22 having a vertical bending section is provided on the left side, and a reinforcing member 22 having a straight shape on the right side is provided.

2A and 2B are a perspective view and a plan view showing a front structure in a front sub-frame according to an embodiment of the present invention.

2A and 2B, the front structure 19 is connected to the side members 12 of the frame structure 13 and has front structure connection portions 15a and 15b protruding from both ends of the front structure. Shaped sub-frame 16 having a convex shape.

The vehicle body connecting portion 21 is formed on the upper surfaces of both ends of the protruding sub frame 16 and the vehicle body connecting portion 21 is connected to the bottom end of the rear end portion of the side member 12, 16 can be supported as a whole.

The front structure connecting portions 15a and 15b are formed in the shape of a rectangular tube and are arranged at predetermined angles such that the side structures 17a and 17b extend outward from the front end of the protruding sub frame 16 As shown in Fig.

A bamboo-type pipe 20, that is, a bamboo-type pipe 20 sloped and sloped at the front end portion is built in the inside of the front structure connecting portions 15a and 15b of both the front and the back of the bamboo-type pipe 20, The front end is exposed to the outside through the side portions of the front structure connecting portions 15a and 15b, and the lower arm "A "

Particularly, the front structure 19 includes two side structures 17a and 17b and a front structure 18, each of which has a hollow bar shape having a box-shaped cross section.

The side structures 17a and 17b are connected to the front structure connecting portions 15a and 15b in the protruding sub frame 16 by a bolt or welding and the rear ends thereof are expanded and extended toward the front side .

At this time, the angle formed by the side structures 17a and 17b may be set to an angle of 20 to 60 °, and the angular range may be set narrower or wider have.

The front structure 18 is installed in a state in which the front structure 18 is substantially parallel to the vehicle body width direction while being horizontally connected between the front ends of the side structures 17a and 17a.

3 is a perspective view illustrating a process of fabricating a protruding subframe in a front subframe according to an embodiment of the present invention.

As shown in FIG. 3, the process of forming the front structure connecting portions 15a and 15b in the protruding sub-frame 16 is shown here.

For example, a bamboo type pipe 20 serving as an assembly hole for assembling lower arm "A" points (not shown) is provided on each of both ends of the protruding sub frame 16, Front structure connecting portions 15a and 15b for receiving the bamboo type pipe 20 inside are fixedly connected to the side of the protruding sub frame 16 through the rear end thereof.

At this time, the front structure connecting portions 15a and 15b have a box-shaped cross-section, so that a bottom plate or the like can be made of super strong steel.

The front end portion of the bamboo-type pipe 20 located inside the front structure connection portions 15a and 15b, that is, the front end portion of the obliquely sloped shape is exposed through the side surfaces of the front structure connection portions 15a and 15b, The lower arm "A "

The bamboo-type pipe 20 is vertically extended from the front end surface of the protruding sub-frame 16, and in the case of the front structure connecting portions 15a and 15b, So that the front end of the bamboo type pipe 20 can be exposed to the side of the front structure connecting portions 15a and 15b naturally.

4 is a side view and a cross-sectional view showing another example of a reinforcing member in a front surf frame according to an embodiment of the present invention.

As shown in Fig. 4, here, an example in which a reinforcing member 22 having an inclined length section is applied is shown.

The reinforcing member 22 is disposed outside the side member 12 and connected between the bumper back beam 10 and the fender apron 11 while the lower end of the reinforcing member 22 is connected to the front structure 19, The side structures 17a and 17b are connected to each other.

The stiffening member 22 thus installed can strengthen the stiffness of the portion where the side member is connected at the fender apron.

Particularly, in the case of the reinforcement member 22, by forming the double box-shaped cross-section together with the side member 12 while being joined in parallel with the side member 12 of the frame structure 13 in a part of the longitudinal section, The rigidity of the region can be enhanced.

Thus, by applying the protruding front structure and the reinforcing member to the basic skeleton structure of the vehicle body, the collision performance and the skeletal rigidity can be increased.

FIG. 5 is a plan view and a cross-sectional view showing a state of securing a gap between an existing structure and an improved structure in a front sub-frame according to an embodiment of the present invention.

As shown in FIG. 5, by implementing a structure (improved structure) in which the deploying direction of the side structures 17a and 17b in the front structure 19 is enlarged outward, a more extended engine room space .

For example, in the case of a front engine room, an enlarged space of about 98 mm can be ensured, and in a rear engine room, an enlarged space of about 43 mm can be secured.

This enlargement of the engine room space makes it possible to provide a space for mounting an engine, a power train, and the like, and as a result, the degree of freedom of engine room layout design can be increased.

6 is a perspective view showing a state in which a gap is ensured when the engine is mounted in a front sub-frame according to an embodiment of the present invention.

It is possible to enlarge the side structures 17a and 17b of the front structure 19 outward to secure a gap (dotted circle) when mounting various engines or power trains, as shown in Fig. 6, It is possible to secure a gap without changing the train, and thus it is possible to increase the degree of freedom of utilization of the mass-produced vehicle.

FIG. 7 is a graph and a simulation image illustrating a frontal new-vehicle safety evaluation analysis for a front sub-frame according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the results of frontal collision and offset collision for a new vehicle equipped with a front sub-frame of the present invention are shown in Table 3 below. (60.1% → 56.3%) and maximum pulse 7G reduction (54G → 47G), and that the IIHS offset collision improved the car body deformation by 11mm (107mm → 96mm).

division Base Review 1 plan Review 2 Review 3 face RTE (%) 60.1 56.3 54.8 56.3 Dipping (mm) 66 73 72 68 Offset Deformation (mm) 107 123 121 96 weight standard + 7.5kg + 6.7kg + 6.0kg

As described above, in the present invention, by applying the front structure extending on the side of the subframe of the protruding structure, the reinforcing member for the body connection strengthening structure, etc., it is possible to secure the body rigidity capable of positively responding to the evaluation of the safety degree of the new vehicle, The space of the room can be maximized.

10: Bumper back beam 11: Fender apron
12: side member 13: frame structure
14: Front subframe 15a, 15b: Front structure connection
16: protruding sub frame 17a, 17b: side structure
18: Front structure 19: Front structure
20: Bamboo type pipe 21: Body side connection part
22: Reinforced member

Claims (5)

The lower portion of the frame structure 13 constituted by the front bumper back beam 10 and the rear fender apron 11 and both side members 12 connected between the bumper back beam 10 and the fender apron 11 A front sub-frame 14 for supporting the front sub-
The front sub-frame 14 includes a protruding sub-frame 16 having front structure connecting portions 15a and 15b protruding from both ends of the front end while being connected to the frame 13, Side structures 17a and 17b of the side structure 17a and 17b that are extended in the forward direction and extend outward toward the front and the front ends of the side structures 17a and 17b extend in the lateral direction And a front structure (19) composed of a front structure (18) connected to the front structure (18).
The method according to claim 1,
The front structure connection portions 15a and 15b on both sides of the protruding sub frame 16 are formed in the shape of a square tube having the bamboo type pipe 20 therein, 20) is assembled to the front end of the lower sub-frame of the automobile body.
The method according to claim 1,
The front structure of the front subframe 14 is connected to the fender apron 11 via the bottom end of the fender apron 11 while being disposed outside the side member 12 of the frame structure 13, And a reinforcing member (22) of a box-like cross-sectional structure for reinforcing the connection of the vehicle body.
The method of claim 3,
Characterized in that the reinforcing member (22) is joined to the side member (12) of the frame structure (13) in parallel with the side member (12) Subframe.
The method of claim 3,
Wherein the reinforcing members (22) of both sides are formed in one of a shape having a linear shape, a shape having a vertical bending section and a sloping section with respect to a length, and being installed in a symmetrical manner or asymmetric shape Lt; / RTI >

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